Make gethostbyname(), gethostbyname_ex(), getnameinfo() use IDNA encoding.

diff --git a/Modules/socketmodule.c b/Modules/socketmodule.c
--- a/Modules/socketmodule.c
+++ b/Modules/socketmodule.c
@@ -3162,12 +3162,16 @@ socket_gethostbyname(PyObject *self, PyO
 {
 	char *name;
 	sock_addr_t addrbuf;
-
-	if (!PyArg_ParseTuple(args, "s:gethostbyname", &name))
+	PyObject *ret = NULL;
+
+	if (!PyArg_ParseTuple(args, "et:gethostbyname", "idna", &name))
 		return NULL;
 	if (setipaddr(name, SAS2SA(&addrbuf),  sizeof(addrbuf), AF_INET) < 0)
-		return NULL;
-	return makeipaddr(SAS2SA(&addrbuf), sizeof(struct sockaddr_in));
+		goto finally;
+	ret = makeipaddr(SAS2SA(&addrbuf), sizeof(struct sockaddr_in));
+finally:
+	PyMem_Free(name);
+	return ret;
 }
 
 PyDoc_STRVAR(gethostbyname_doc,
@@ -3322,7 +3326,7 @@ socket_gethostbyname_ex(PyObject *self, 
         struct sockaddr_in addr;
 #endif
 	struct sockaddr *sa;
-	PyObject *ret;
+	PyObject *ret = NULL;
 #ifdef HAVE_GETHOSTBYNAME_R
 	struct hostent hp_allocated;
 #ifdef HAVE_GETHOSTBYNAME_R_3_ARG
@@ -3337,10 +3341,10 @@ socket_gethostbyname_ex(PyObject *self, 
 #endif
 #endif /* HAVE_GETHOSTBYNAME_R */
 
-	if (!PyArg_ParseTuple(args, "s:gethostbyname_ex", &name))
+	if (!PyArg_ParseTuple(args, "et:gethostbyname_ex", "idna", &name))
 		return NULL;
 	if (setipaddr(name, (struct sockaddr *)&addr, sizeof(addr), AF_INET) < 0)
-		return NULL;
+		goto finally;
 	Py_BEGIN_ALLOW_THREADS
 #ifdef HAVE_GETHOSTBYNAME_R
 #if   defined(HAVE_GETHOSTBYNAME_R_6_ARG)
@@ -3370,6 +3374,8 @@ socket_gethostbyname_ex(PyObject *self, 
 #ifdef USE_GETHOSTBYNAME_LOCK
 	PyThread_release_lock(netdb_lock);
 #endif
+finally:
+	PyMem_Free(name);
 	return ret;
 }
 
@@ -4140,7 +4146,7 @@ socket_getnameinfo(PyObject *self, PyObj
 				"getnameinfo() argument 1 must be a tuple");
 		return NULL;
 	}
-	if (!PyArg_ParseTuple(sa, "si|ii",
+	if (!PyArg_ParseTuple(sa, "eti|ii", "idna",
 			      &hostp, &port, &flowinfo, &scope_id))
 		return NULL;
 	PyOS_snprintf(pbuf, sizeof(pbuf), "%d", port);
@@ -4193,6 +4199,7 @@ socket_getnameinfo(PyObject *self, PyObj
 fail:
 	if (res)
 		freeaddrinfo(res);
+	PyMem_Free(hostp);
 	return ret;
 }